From: Thomas Faber <thfabba@gmx.de>
Date: Fri, 2 Mar 2012 08:41:50 +0000 (+0100)
Subject: usb: gadgetfs: return number of bytes on ep0 read request
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=85b4b3c8c189e0159101f7628a71411af072ff69;p=deliverable%2Flinux.git

usb: gadgetfs: return number of bytes on ep0 read request

A read from GadgetFS endpoint 0 during the data stage of a control
request would always return 0 on success (as returned by
wait_event_interruptible) despite having written data into the user
buffer.
This patch makes it correctly set the return value to the number of
bytes read.

Signed-off-by: Thomas Faber <thfabba@gmx.de>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index ae04266dba1b..4f18a0e46070 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -1043,6 +1043,8 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 // FIXME don't call this with the spinlock held ...
 				if (copy_to_user (buf, dev->req->buf, len))
 					retval = -EFAULT;
+				else
+					retval = len;
 				clean_req (dev->gadget->ep0, dev->req);
 				/* NOTE userspace can't yet choose to stall */
 			}